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Standard XII

Chemistry

Standard Electrode Potentials

For the cell ...

Question

For the cell $Z n (s) | Z n^{2 +} (a q) | | C u^{+ 2} (a q) | C u (s)$ . The cell potential $E_{c e l l}$ can be increased.

By increasing

[C u^{+ 2}]

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By increasing

[Z n^{+ 2}]

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By decreasing

[C u^{+ 2}]

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By decreasing

[Z n^{+ 2}]

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Solution

The correct option is A By increasing $[C u^{+ 2}]$
Solution
$E_{c e l l} = E_{c e l l}^{0} - \frac{2.303 R T}{n F} l o g \frac{[Z n^{2 +}]}{[C u^{2 +}]}$
By increasing conc. of Cu , cell potential will increase.
The correct answer is A

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Similar questions

Q. For the cell,

Z n (s) | Z n^{2 +} (a q) | | C u^{2 +} (a q) | C u (s)

The cell potential

E_{c e l l}

can be increased:

Consider the cell:

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | | C u

The standard reduction potential are

0.350

V for

C u^{2 +} (a q) + 2 e^{-} \to C u

and

- 0.763

V for

Z n^{2 +} (a q) + 2 e^{-} \to Z n

The cell reaction is:

Consider the cell:

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | | C u

The standard reduction potential are 0.350 V for;

C u^{2 +} (a q) + 2 e^{-} \to C u

and -0.763 V for;

Z n^{2 +} (a q) + 2 e^{-} \to Z n

Assertion: The reaction is spontaneous.

Reason: The cell potential is positive.

Q. Consider the cell,

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | C u

The standard reduction potentials are

+ 0.35 V

for

2 e^{-} + C u^{2 +} (a q) \to C u^{2 +} (a q) (1.0 M) | C u

The standard reduction potentials are

+ 0.35 V

for

2 e^{-} + C u^{2 +} (a q) \to C u

and

- 0.763 V

for

2 e^{-} + Z n^{2 +} (a q) \to Z n

Calculate the emf of the cell and tell whether the cell reaction spontaneous or not ?

$E^{0}$ for the cell, $Z n | Z n {^{2 +}}_{(a q)} | | C u {^{2 +}}_{(a q)} | C u$ is $1.10 V$ at $25^{0} C$ . The equilibrium constant for $Z n + C u {^{2 +}}_{(a q)} \to Z n {^{2 +}}_{(a q)} + C u$ the cell reaction is of the order of :

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For the cell Zn(s)|Zn2+(aq)||Cu+2(aq)|Cu(s). The cell potential Ecell can be increased.

The correct option is A By increasing [Cu+2]SolutionEcell=E0cell−2.303RTnFlog[Zn2+][Cu2+]By increasing conc. of Cu , cell potential will increase.The correct answer is A

For the cell $Z n (s) | Z n^{2 +} (a q) | | C u^{+ 2} (a q) | C u (s)$ . The cell potential $E_{c e l l}$ can be increased.

The correct option is A By increasing $[C u^{+ 2}]$
Solution
$E_{c e l l} = E_{c e l l}^{0} - \frac{2.303 R T}{n F} l o g \frac{[Z n^{2 +}]}{[C u^{2 +}]}$
By increasing conc. of Cu , cell potential will increase.
The correct answer is A